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Fair Value Impairment of Long-Lived Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired Long Lived Assets, Fair Value $ 0.0 $ 0.0
Impairment of Long-Lived Assets to be Disposed of 28.8 1.5
Other Assets and Deferred Charges [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired Long Lived Assets, Fair Value 0.0 0.0
Impairment of Long-Lived Assets to be Disposed of $ 1.2 $ 0.0